Blowtorch and pot



May 24 1927. 1,629,628

J. D. KELVIE, JR

BLW TORCH AND POT Filed Aug. 1, l1924 IIIII* uuml Patented Maty 24, 1927.

Lezazsy narranV lSTATES PATENT A oFF-ice.

JAMES D; xnrvmaa., vor Yivrassrnnoiv, omo.

ynnow'rojacn AND Por.

Application filed August 1, 1924i i Serial No. 729,507.

The invention relates to blow torches and pots in which a liquid hydrocarbon yfuel is volatilized and the gas thus formed mixed with air and burned in a nozzle to provide either a horizontal or vertical flame for use in soldering, brazing, melting, andthe like; and the object of the improvement is to provide a blow torch and pot having a nozzle so constructed as to provide an easily started horizontal or verticalv high temperature flame under conditions of efficient combustion. v Y

'The requirements for a high/temperature flame under eliicient combustion conditions are proper feed control of the liquid hydrocarbon fuel, proper volatilization of the fuel to form a gas, and proper mixing of the gas with air before combustion occurs. When screw valve means are used to conf trol the flow of gas, the temperature of the nozzle when the torch is inroperation is so high that the valve seat and stem'expand, and consequently warp upon cooling so thatl the valve becomes imperfect in operation.

Again, the burner of a torch `must be heated to start the torch; and torches having an auxiliary bowl beneath the nozzle burner in which a quantity of the liquid fuel is placed and lighted in order to heat the burner to combustion temperature, arev inconvenient in use because the liquid fuel for filling the auxiliary bowl must be obtained either from the torch tank or elsewhere.

Also a. torch adapted to deliver a horizontal flame is not always adapted to deliver conveniently a vertical llame.

These difiiculties are overcome and a torch is provided, which burns efficiently anydesired hydrocarbon fuel such as hydrocarbon oil, gasolene, or benzenes, by the present invention, in which a starting bowl is incorporated in the nozzle; and in which the nozzle may be used by proper adjustment to direct either a horizontal or vertical flame; and in which the volatilization cham- A preferred form of the invention is illnustrated in vthe accompanying drawings forming part hereof, in whichy i' Figure 1 is a'fragmentary side elevation ofthe device setup for use'L as a blow torch to deliver a horizontal flame, the nozzle and fuel control valve being shown in section;

Fig. 2, a fragmentary frontendelevation ofthe same;

Fig. 8, a cross section of the nozzle-on line III-III, Fig. 1; and f Fig. 4, a sideelevation of the device set for use as ya blow potI to deliver a vertical flame.

Similar numerals refer to Vsimilar parts throughout the drawings.

The blow torchandpot includes the fuel pressure tank 1, the fuel control valve 2, and the nozzle 3. A hand airpump 4 is provided to create the necessary pressure in the tank, and a removable screw plug 5 inthe bottom of the tank permits thefiilling there of with liquid hydrocarbon fuel. From the fuel control valve 2, an angle` fuel` delivery pipe 6 depends to the bottom part of the tank. ,A suitable vhandle 1a is attached to the tank for carrying the torch.

In the upper spherical wall 7 of the tank is located a bushing 7-, into which the fuelv control valve is threaded, the fuel delivery pipe 6 beingthreaded into the lower end 2a of the valve as shown. In the. valve a delivery passage 8 leadsfrom the deliverypipe to the control chamber 9 having a conical outlet and valve seat 9a leading to fuel vreservoir 9C in the upper end 2b of they valve.'

The control chamber 9 is located in an outwardly extending neck 9b ofthe valve, and a packing cap 10 having a central aperture 10a is threaded thereon.. Through the central aperture 10a kthe valve pin 11 passes and is threaded in the control chamber 9. The valve pin has an end portion 11aM of smaller diameterthan the pin, and whichy carries a cone 11b seating in the outlet 9a, and adjust able therein by the turning of thethreaded valve pin. i

The nozzle 3 is provided with two inlets 13 and 13a, either one of which may be alternately screwed uponthe upper lend 2b of the fuel control valve 2. A screw plug 14 is provided to close the inlet when not screwed upon the valve. Both inlets lead to the same primary volatilizing chamber 15 in the nozzle 3.

A As set up' in Fig. 1, the inlet 13 is threaded upon the control valve, and the plug 14 closes inlet 1%. Nozzle 3 is a cored casting, and the primary volatilizing chamber 15 opens through end passage 15CL intothe secondary volatilizing chamber 16,-which is connected by port 17 located at the end opposite the passage 15a to gas reservoir 1S. Gas delivery orifice 19, having a fixed aperture area, and being removably threaded in aperture 19a of partition wall 19h, leads from the gas reservoir 18 to the gas mixing chamber 20, and a mixture passage 21 opens therefrom into the burner tip 22.

The nozzle being a cored casting, screw plugs 23 and 24 are provi-ded to close the ends of the openings 18:L and 16a respectively, of reservoir 18 and chamber 16.

Air is admitted to the mixing chamber 20 through ports 21S-and 25a, the ports 25a being so placed that bowl walls '26 and A2? are formed in the mixing chamber. Breather port-s 28 are provided in the outside wall 22a of the burner tip 22.

The operation of the torchas set up in Fig. 1, may now be described. A liquid hydrocarbon having been placed in the tank 1, valve pin-11 is set so as to permit fuel passage through outlet 9a, and pressure is set" upin thetank by means of the air pump which forces liquid fuel up through the -delivery pipe 6, the delivery passage '8, the control chamber 9, the outlet il, the reservoir 9c, the' primary volatilizing chamber 15, the the end passage 15, the secondary volatilizing chamber 16, the port 17, the gas reservoir 18, and the gas delivery orifice into the bowl 29 formed by the bowl walls 26 of the mixing cl amber 20, and through the mixture passage 21 to the burner bowl 22". Liquid fuel now fills all the chambers of the nozzle upto the level reached in the bowls, and the valve pin is set to maintain this level.

The liquid fuel thus maintained in the mixing and burner bowls .is then lighted, and generates heat which gradually raises the temperature of the nozzle parts to a degree sufficient to volatilize the liquid fuel .in the volatilizing chambers 15 and 16; land this volatilized fuel will burn for some time, as its own generated pressure forces it through the gas orifice 19. It is to be understood that in accordance with usual practice, the volatilizing chambers 15 and 16 are filled with fine brass or copper gauze not shown for facilitating the breaking up of the liquid fuel and the formation of the gas.

In torches having an auxiliary preheating bowl separate from and below the burner tip, the liquid fuel placed in the auxiliary bowl and lighted to heat the burner tip to proper combustion temperature often burns out before the torch operator opens the fuel valve to admit fuel gas.

In the device of the present invention as aforesaid, the fuel in the integral preheating bowls, and the nozzle chambers below sustain a nozzle preheating flame fora comparatively long time, until the operator is ready to open the fuel valve; and, by maintainingthe pressure in the tank, cause gas to be delivered through the gas delivery orifice 19, .by the above described volatilizing action of the nozzle.

lThe fuel valve being sufficiently opened, gas thus delivered through the orifice 19, mines with air admitted through-ports and 25a in mixing chamber 20, and the mixture passes through passage 21 to the burner tip 22, where-it is eiiicientiy burned in aV horizontal blow flame.

The' action of the device set up as a blow pot, as in Fig. 4, is substantially thefsame, excepting that, in this case, the walls '27 of the mixing chamberfform a starting bowl 310.

l/Vhen valve screw fuel control means are employed to control 'the gas passage through the gas delivery tub-e 19, it has been found that expansion and contraction soon renders the operation of the valve imperfect. `In op'- eration, the liquid controlling valve '2 lof the presentinvention is always cooler than the nozzle, and the cone end 11br f the valve pin 11 is always immersed in the liquid fuel which is maintained in liquidform beyond the cone end and in the reservoir v9c, volatilization taking place in the chambers 15 and 1.6. Thus the valve fuel control means of the present invention constantly cooled by the passage of the liquid fuel. and is capable of operating per rectly for a longen time :than a valve cont-rollingr the fuel :flow after the fuel has become volatilized.

I claim:

1. A blow torch for burning liquid hydrocarbonfu-cl and the like, including in communication with each other a tank for the fuel and a fuel con-trol valve, anda burner nozzle havin-g a plurality of apertures for selective communicating connection with the fuelcontrol valve and the tank.

2. A blow torch for burning liquid hydrocarbon fuel and the like, including incomm-nnication with each other a tank for the fuel and a fuel control valve, anda burner nozzle having a plurality of apertures for selective communicating connection with the fuel control valve and the tank, the nozzle having integral walls forming bowls for receiving liquid fuel-to start the torchin-the several positions of the burner nozzle.

3. A blow torch for volatilizing, mixing with air, and burning liquid hydrocarbon fuel and the like, including in communication with each other and a tank for the fuel, a fuel control valve, and a unitary'volatilizing, mixing and burner nozzle, having a plurality of apertures for selective communieating connection with the fuel control valve and the tank.

41. A blow torch for volatilizing and burning liquid hydrocarbon fuel and the like, including in communication with each other a tank forthe liquid fuel, a fuel control valve acting upon the liquid fuel, and a nozzle, the nozzle including in communication with each other ay volatilizing chamber, a. removable gas delivery orifice, and a burner tip, and thenozzle having a plurality of apertures for selective communicating connection with the fuel control Valve and the tank.

5. A blow torch for volatilizing, mixing with air, and burning liquid hydrocarbon fuel and the like including in communication with each other, a tank. for the liquid fuel, a fuel control valve acting upon the liquid fuel,and a nozzle, the nozzle including in communication with each other, a volatilizing chamber, a removablegas delivery orifice, a mixing chamber, and a burner tip, and the nozzle lhaving a plurality of apertures for selective communicating connection with the fuel control valve and the tank.

6. A blow torch for volatilizing, mixing with air, and burning liquid hydrocarbon fuel and the like, including in communication with each other a tank for the liquid fuel, a fuel cont-rol valve acting upon the liquid fuel, and a nozzle, the nozzle including in communication with each other a volatilizing chamber, a gas reservoir, a removable gas delivery orifice, a mixing chamber, and a burner tip, and the nozzle having a. plurality of apertures for selective communicating connection with the fuel control valve and the tank.

7. A nozzle for a blow torch, including a volatilizing chamber, a mixing chamber, and a burner tip in communication with each other, the volatilizing chamber having a plurality of apertures for selective communicating connection with a fuel control valve and a fuel tank.

8. A nozzle for a blow torch including a mixing chamber having walls forming a starting bowl for receiving liquid fuel to start the torch, and in communication therewith a plurality of apertures for interchangeable communicating connection with a fuel control valve and a fuel tank.

9. A nozzle for a blow torch including a burner tip having walls forming a starting bowl for receivingvliquid fuel to start'the torch, and` in communication therewith a plurality of apertures for interchangeable communicating connection with .a fuel control valvey and a fuel tank.

10. A nozzle for a blow-torch including a mixing chamber and a burner tip incommunication ywith each other, the walls of the chamber and tip forming starting bowls for receiving liquid fuel to start the torch, and in communication therewith a plurality of apertures for interchangeable communicating connection with a fuel control valve and a fuel tank.

11. A nozzle for a blow torch including in a unitary structure, a primary volatilizing chamber, a seconda-ry volatilizing chamber, a mixing chamber and a burner tip in communication with each other, and with a plurality of apertures for interchangeable communicating connection with a fuel control valve and a. fuel tank.

l2. A nozzle for a blow torch including in a unitary structure, a.l volatilizing chainber, a. gas delivery orifice having a fixed aperture area, and a burner tip in communiction with each other, and with a plurality of apertures for interchangeable communicating connection with a fuel control valve and a fuel tank.

13. A nozzle for a blow torch including in a unitary structure, a volatilizing .chamber, a gas delivery orifice having a lfixed aperture area, a' mixing chamber, and Aa burner tip in communication with each other, and with a plurality of apertures for interchangeable communicating connection with a fuel control valve and a. fuel tank. Y

14. A nozzle for a blow torch including in a unitary structure, a volatilizing chamber, a gas reservoir, a gas delivery orifice having a iixed aperture area, a mixingv chamber, and a burner tip in communication with each other, and with va plurality of apertures for interchangeable communieating connection with a fuel control valve and a, fuel tank. y

In testimony that I claim the above, I have hereuntosubscribed my name.

JAMES n. KnLvin, JR. 

